LOS ANGELES - Attorneys for Frank McCourt want a judge to grant immunity from prosecution to the sister of one of two men accused of attacking Bryan Stow, the San Francisco Giants fan left brain-damaged by a beating outside Dodger Stadium more than two years ago.

McCourt's lawyers say 33-year-old Dorene Sanchez's deposition testimony is needed in their preparation of the team's defense, but that she refused to answer most questions when questioned in the civil case in November. The woman was previously given immunity by prosecutors who questioned her during last year's preliminary hearing in the criminal case, but she still asserted her Fifth Amendment privilege during the deposition.

Stow's lawsuit was filed in Los Angeles Superior Court in May 2011. The defendants in the case have been reduced to former Dodgers owner McCourt and three of his former team entities. The claims include assault, battery, negligence, premises liability, negligent hiring and both intentional and negligent infliction of emotional distress.

Stow, now 43 and a resident of the Santa Cruz area, suffered a fracture that resulted in the loss of a portion of his skull. The former paramedic also has brain damage. McCourt has filed a cross-complaint against Stow's two alleged assailants, Marvin Norwood, 32, and Louie Sanchez, 31.

Dorene Sanchez is Sanchez's sister and the fiancee of Norwood. She still lives in Rialto, where the men also resided before being jailed.

Defense lawyers say Sanchez and Norwood have refused to testify during depositions on the advice of their attorneys, who note that the criminal case has not yet gone to trial.

But Doreen Sanchez, also acting in consultation with her lawyer, Daniel Nardoni, asserted a right against self-incrimination at her deposition, even though she never was charged.

During the 2012 preliminary hearing, Dorene Sanchez testified that she, her brother and Norwood were involved in a parking lot confrontation with Giants fans, in which Norwood pushed a Giants fan away from Sanchez and held Sanchez back as he tried to reach the Giants fans.

Sanchez's sister testified that her brother told her after the group of Giants fans walked away that "those guys were talking (expletive)" and that he walked briskly and disappeared into the crowd in the parking lot -- with Norwood following behind -- after she she said she had heard them "talking (expletive)."

She testified that the two returned to the car about four to five minutes later and instructed her to drive away, and that Norwood had blood on the inside of his right palm.

But during the November deposition, Dorene Sanchez would not answer such basic questions as whether Norwood was her fiance, if he was the father of any of her three children, if she had given previous testimony in the case and if she went to dinner in Chinatown after the baseball game.